Nathaniel Smith <> added the comment:

This is a duplicate of bpo-26692 and bpo-23530, and possibly others.

My impression is that len(os.sched_getaffinity(os.getpid())) is the Right 
Guess. Currently sched_getaffinity isn't implemented on Windows, but bpo-23530 
has some example code for how it could/should be implemented.

@M J Harvey: does this return the right thing for your batch jobs?

nosy: +njs

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